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Hexadecimal

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just a quickie - could some explain to me what hexadecimal is in A+ terms... there is someone in my head thats saying to me that is something to do with Maths...

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So the next hurdle to challenge the weary A+ student,like me,is Hex a.k.a the HEXADECIMAL numbering system.

Hex uses a base 16 system,from 0 through 15.Since we only have 0,1,2,3,4,5,6,7,8,9 to represent numbers from 0 to 9, hexadecimal (we'll call it 'hex' from this point onwards) represents numbers 10,11,12,13,14,and 15 with the letters A,B,C,D,E and F..as follows

Now,take an 8 bit binary number,say 10111101......10111101 = 189.
To work out the Hex equivalent of 10110101 we need to break down the binary number into blocks of 4 bit binaries.So 10111101 would become 1011 and 1101 (this applies to higher bit binary numbers,12 bit,16 bit,20 bit and so on,break them down into blocks of 4 bit binaries)..

Ok,1011,thats easier to work with and 1101 is a doozy.
1011 is binary equivalent for 11
1101 is binary equivalent for 13

11=B
13=D

Hex is truly represented as a 4 digit code so BD will be displayed as 00BD.

00BD = 10111101 = 189

hex to binary to decimal.

The GOLDEN rule is to break the binary number down into 4 bit binaries.

I need more than one! I will go regroup now then tomorow re-read everything and try to come up with my own chart to see if I fully understand all of this and will post back here for you guys to correct me if I'm wrong, if you will.

All I can say is, Mike finally understands what Binary means [for A+, at least], THANKS!!!!

No offense to any of the others here who tried to explain this, we all explain things in different ways, fortunately for me, Malnomates's explanation was easiest for me to understand, now let me go see if I can understand Hex.

one day i will understand... just found more info on hex and binary, will share documents if needed. Hey i know, what we need on this site is a Member area where we can all submit notes documents and useful info etc? or am i being an idiot?

one day i will understand... just found more info on hex and binary, will share documents if needed. Hey i know, what we need on this site is a Member area where we can all submit notes documents and useful info etc? or am i being an idiot?

Click to expand...

we do that anyway - share useful info, with the notes, you'd be lucky if you could read mine, i just about read it myself!
notes are notes, the person who are writing them, are writing them for themselves...

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